Neutral atoms of neon (atomic number 10) have the same number of electrons as each of the following except:
na^+
mg^+2
f^-
ar
0^-2

Answer : The correct option is, Ar

Explanation :

(1) The element is,

Atomic number of Na = 11

The general electronic configuration of Na is,

The electronic configuration of is,

The number of electrons in = 10

(2) The element is,

Atomic number of Mg = 12

The general electronic configuration of Mg is,

The electronic configuration of is,

The number of electrons in = 10

(3) The element is,

Atomic number of F = 9

The general electronic configuration of F is,

The electronic configuration of is,

The number of electrons in = 10

(4) The element is, Ar

Atomic number of Ar = 18

The general electronic configuration of Ar is,

The number of electrons in Ar = 18

(5) The element is,

Atomic number of O = 8

The general electronic configuration of O is,

The electronic configuration of is,

The number of electrons in = 10

From this we conclude that, the option 1, 2, 3 and 5 have the same number of electrons as the neutral atom of neon. While in 'Ar' there are 18 number of electrons.

Hence, the correct option is, Ar

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